Absorption mercury

With an increase in pH, there is an increased absorption of mercuric chloride [6, 7], whereas accumulation of mercury in the intestinal tissue decreases. Mercury absorption is inversely proportional to its accumulation in the tissue. An increase in water absorption due to hypotonicity or an increase in concentration of sodium ions or urea increases the mercury absorption and accumulation in the epithelial cell, without change in the intracellular distribution pattern [8], Thus, the absorption of mercury is thought to accompany the solvent drag and to be influenced by pH change in the intestinal lumen. 

The mercury absorption of HgN03 in 0.1 M NaN03 solutions exhibited a typical Langmuir isotherm curve, as shown in Figure 4a. The maximum loading is 635 mg/g (or 3.2 mmol Hg/g). Similar adsorbing behavior is observed for other mercury species, such as... 

Chemical analysis of expl reaction products has been performed utilizing spectroscopic methods. A study of the thermal decompn of Tetrazene at 90° has demonstrated that substantially complete conversion to 5-aminotetra-zoie is effected (Ref 69). Spectroscopic evidence has indicated that this product is derived from both the side chain (guanyl azide) and the Tetrazole ring. Utilizing the unique-to-mercury absorption line at 2536.5a, mercury (II) concn... 

Despite several warnings over many years, the use of mercuric chloride solutions during operations in an attempt to kill cancer cells implanted in healthy tissues persists in some countries. Intraperitoneal administration, when seeding of a visceral cancer is feared, carries the risk of mercury absorption and nephrotoxicity. Death from intoxication after peritoneal lavage with a mercuric chloride solution has been reported (3). 

Figure 2. A composite calibration curve for mercury in seawater samples measured over a three-week period. The mercury spike quantities are in ng and the mercury absorption in arbitrary units (21).

Absorption is high (approximately 70-80%) for inhaled metallic mercury vapor, and negligible for oral exposure to liquid metallic mercury. Absorption of inorganic mercuric salts may range from 2 to 38% depending upon the form and test conditions. Oral absorption of organic mercury is nearly complete, but respiratory absorption data are lacking, particularly for the alkyl mercurials. 

Foulkes EC, Bergman D. 1993. Inorganic mercury absorption in mature and immature rat jejunum Transcelluar and intercellular pathways in vivo and in everted sacs. Toxicol Appl Pharmacol 120 89-95. 

Okawa, K., H. Saito, I. Kifiine, T. Ohshina, M. Fujii, and Y. Takizawa. 1982. Respiratory tract retention of inhaled air pollutants. 1. Mercury absorption by inhaling though the nose and expiring through the mouth at various concentrations. Chemosphere 11(9) 943-951. 

Figure 12.3. Apparatus used for cold-vapor mercury absorption measurement...

Fortmann LC, Gay DD and Wirtz KO (1978) Ethylmercury Formation in Plant Tissues and Relation to Methylmercury Formation. US EPA Ecological Research Series, EPA-600/3-78-037. Eoulkes EC and Bergman D (1993) Inorganic mercury absorption in mature and immature rat jejunum Transcellular and intracellular pathways in vivo and in everted sacs. Toxicol Appl Pharmacol 120 89-95. 

Smith, R.G. (1972) Dose-response relationship associated with known mercury absorption at low dose levels of inorganic mercury. In hartung, R. and Dinman, B.D., eds. Environmental mercury contamination. Ann Arbor Science publishers, Inc, Ann Arbor, Michigan, p. 207-222, 342-345. 

Block R, Beysovec L (1982) Promethazine toxicity through percutaneous absorption. Contin Pract 9 28 Bork K, Morsches B, Holzmann H (1973) Mercury absorption out of ammoniated mercury ointment. Arch Dermatol Forsch 248 137-143... 

Kostial K, Rabar I, Blanusa M, Ciganovit M (1980a) The influence of trace elements on cadmium and mercury absorption in sucklings. Bull. Environ. Contam. Toxicol 25 436-440... 

Mercury vapor is well absorbed through inhalation (about 80%), while liquid mercury is poorly absorbed by the gastrointestinal tract (about 0.01%). Due to its high lipophilicity and diffusibility, mercury vapor is readily transferred across the cell membranes. When mercury vapor is inhaled, it efficiently enters the blood stream through the alveolar membrane and is quickly distributed between the plasma and red blood cells (RBCs). Little is known about the efficiency of elemental mercury absorption through the skin. 

Pig. 10.20. Set-up for sum-frequency generation between a blue and a red diode laser to achieve the 254 nm mercury line upper left). The mercury absorption spectra recorded at low pressure for natural isotopic mixture (a) and isotopically enriched samples in (6) and in (c), are also included in the right part... 

A special technique for the flameless atomic absorption analysis of mercury involves room-temperature reduction of mercury to its elemental state by tin(II) chloride in solution, followed by sweeping the mercury with air into an absorption cell having end windows made of ultraviolet-transparent silica (SiOj). Nanogram (10 g) quantities of mercury can be determined by measuring mercury absorption at 253.7 nm. 

Porosity ideally through mercury absorption, to be preferred to more common oil absorption techniques. pH silica are normally slightly acidic (5.5-7.0). 

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